Solid electrolyte and electrochemical system including the solid electrolyte

Abstract

Solid electrolyte comprising organic compound containing the organic polymer with hydroxyl group, inorganic compound, and water intended to provide the solid electrolyte that is less susceptible to performance deterioration even under high temperatures of 100° C. or higher and the electrochemical system using the said solid electrolyte. It is a principal object of this invention to provide the basic means for producing the solid electrolyte comprising the hybrid compound where part of or all of the hydroxyl groups of the organic polymer with hydroxyl group are combined with at least one species of phosphoric acid and boric acid by immersing the hybrid compound in the solution containing at least one species of phosphoric acid and boric acid; otherwise by coating it with the said solution. Moreover, the said hybrid compound is made by neutralizing inorganic salt by acid in the raw material solution with the organic compound containing the organic polymer with hydroxyl group coexisting, removing solvent, where the solution after the neutralization process contains at least one species of phosphoric acid and boric acid. Hereby, part of or all of the hydroxyl groups of the organic polymer with hydroxyl group are combined with at least one species of phosphoric acid and boric acid.

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         24 . A method for improving the proton conductivity of a solid electrolyte comprising a hybrid compound composed of an organic compound containing an organic polymer having at least one hydroxyl group, an inorganic compound and water, the method comprising the steps of immersing the hybrid compound in a liquid that contains at least one species of phosphoric acid and boric acid or coating the hybrid compound in a liquid that contains at least one species of phosphoric acid and boric acid. 
     
     
         25 . The method of  claim 1  wherein the inorganic compound contains at least one species selected from the group consisting of a silicic acid compound, a tungstic acid compound, a molybdic acid compound, a stannic acid compound and a zirconic acid compound. 
     
     
         26 . The method of  claim 1  wherein the hybrid compound is prepared by neutralizing the inorganic compound salt by acid or alkali in a raw material solution and where the organic compound containing the organic polymer with hydroxyl group coexists, and thereafter removing the solvent. 
     
     
         27 . The method of  claim 26  wherein the inorganic compound salt is at least one species of metal salt of silicic acid, tungstic acid, molybdic acid, and stannic acid; otherwise, it is zirconium halide and/or oxyzirconium halide. 
     
     
         28 . The method of  claim 27  and wherein the metal salt of silicic acid, tungstic acid, molybdic acid and stannic acid is an alkali metal. 
     
     
         29 . The method of  claim 27  wherein the zirconium halide or oxyzirconium halide is zirconium chloride or zirconium oxychloride. 
     
     
         30 . The method of  claim 24  and wherein the organic polymer with at least one hydroxyl group is polyvinyl alcohol. 
     
     
         31 . The method of  claim 24  wherein the hybrid compound is either immersed in a liquid containing at least one species of phosphoric acid and boric acid, or it is otherwise coated with the liquid containing at least one species of phosphoric acid and boric acid while being heated to a temperature of 60° C. or higher. 
     
     
         32 . The method of  claim 24  wherein the hybrid compound is immersed in a liquid containing sulfuric acid or coated with the liquid containing sulfuric acid prior to being immersed in or coated with the liquid containing at least one species of phosphoric acid and boric acid. 
     
     
         33 . The method of  claim 32  wherein the hybrid compound is immersed in a liquid containing sulfuric acid or is coated with the liquid containing sulfuric acid while being heated at a temperature of 60° C. or higher.